The true story of a decades-long conflict between the Los Angeles Police Department, under the determined leadership of Police Chief William Parker, and ruthless criminal elements led by Mickey Cohen, a one-time boxer who rose to the top of L.A.'s criminal world. The series is a fast-paced crime drama set in Los Angeles during the 1940s and '50s. It's a world of glamorous movie stars, powerful studio heads, returning war heroes, a powerful and corrupt police force and an even more dangerous criminal network determined to make L.A. its West Coast base.

This is a dark story about the world of cops and criminals is based on real events. The main components of this world of gangsters have: bloated ministers, dirty money, dusty hats on heads and musty taverns.
Protagonists William Parker and Mickey Cohen. William is the Head of the Police Department of Los Angeles. There are many who call him a true American hero. Because he is honest and always on the side of truth. And Mickey, is the californian fighter and leader of the criminal world of Los Angeles. Together with his band, he allows himself to do on the streets all that he pleases. This is includes assault, robbery and brutal killings. Mickey is convinced that no one can stop his. And he has no fear of justice. Therefore, he makes more and more crimes.
For many years, William and Mickey fighting among themselves for the soul of this city.